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Elektrika
Published by Universitas Semarang
ISSN : 20850565     EISSN : -     DOI : -
Core Subject : Engineering,
Electrical & Electronics Engineering
Jurnal eLEKTRIKA diterbitkan oleh Jurusan Teknik Elektro, Fakultas Teknik, Universitas Semarang sejak tahun 2009, dan terakreditasi oleh Kementerian Ristekdikti pada tanggal 29 Januari 2009, dengan No. ISSN 2085-0565. Jurnal eLEKTRIKA adalah jurnal open akses dengan pelibatan mitra bebestari (peer-reviewed yang terbit dua kali dalam setahun, Maret dan Oktober.
Arjuna Subject : -
Articles 117 Documents
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Studi Pelepasan Beban Pada PLTU Keramasan Saat Terjadi Penurunan Frekuensi Melingga lingga; Abdul Azis; Irine Kartika Pebrianti
Elektrika Vol. 13 No. 2 (2021): Oktober 2021
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v13i2.3707

Abstract

The demand for electric power increases along with the development of technological progress and development. The use of electricity is an important factor in people's lives, both in households, lighting, communication, and industrial. The purpose of this research is to calculate the frequency response before load shedding, to calculate the frequency response after load shedding and to analyze the load recovery after normal frequency in the load. The methods to be used in writing and discussing this research are: Observation Method, Interview Method / Interview, Literature Study Method. Based on the calculation of the data in the previous chapter, the following conclusions can be drawn, the calculation of the conditions before carrying out the load shedding is based on the rate of decreasing frequency from the result obtained is 1.6 Hz / s, then to calculate the time used in determining the frequency at the time of load shedding then the results obtained are 54 Hz, Meanwhile, to calculate the frequency after load shedding that is obtained is 49.1 Hz, Calculation of load shedding time is expected when there is a decrease in frequency of 10.5 seconds, Calculation of the load rate of increase expected after load shedding then the optimal load value that must be removed is 5.55 w.  
Rancang Bangun Gelang Locator Pasien Terkonfirmasi Covid-19 dengan Metode Haversine sebagai Pengidentifikasian Pelanggaran Zona Aman Isolasi Mandiri Menggunakan Komunikasi Lora (Long Range) Ahmad Afan Maulana; Riza Alfita; Achmad Fiqhi Ibadillah
Elektrika Vol. 13 No. 2 (2021): Oktober 2021
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v13i2.3669

Abstract

Positive cases of COVID-19 continue to grow rapidly. This prompted the government to make new rules in the form of various types of health protocols. One of them is the implementation of the self-isolation protocol for confirmed COVID-19 patients. Self-isolation is a rule that requires confirmed patients to stay at home until the specified time limit to break the chain of COVID-19 development. However, it is suggested and as a rule that there are still many ODP and PDP who still violate the rules of self-isolation from the government. The ODP and PDP still roam freely without thinking about the impacts and risks to their surroundings. With the departure of confirmed patients, the risk of developing COVID-19 becomes greater. In this study, a confirmed patient locator bracelet was made that can map the position of the patient based on latitude and longitude. The latitude and longitude data from the bracelet is sent to the gateway by LoRa communication. LoRa communication is also used to minimize the dimensions of the bracelet. In addition to mapping the location of the patients, by applying the Heversine method this system is able to identify when a safe zone violation occurs in the form of a change in the color of the marker. In the future, it is hoped that this system will be able to handle the problem of developing COVID-19 caused by confirmed patients who still violate the self-isolation protocol.
Analisis Elektrik Motor Penggerak TBS (Traveling Band Screen) PLTU Puri Muliandhi; Isya Aryan Sulistyo
Elektrika Vol. 14 No. 1 (2022): April 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i1.5040

Abstract

The Traveling Band Screen (TBS) is a means of filtering trash and sea creatures such as jellyfish in the PLTU Intake area. FFB filters waste by rotating the screen, then the waste is sprayed using backwash water so that the filtered waste can fall into the disposal route. The amount of impurity material stuck on the screen has an impact on the decrease in flow capacity, thus affecting the increase in the load of the TBS motor and causing the TBS to become overloaded so that the PLTU will Shut Down, so an analysis is needed to determine the electric ability of the motor drive of the TBS system to block the screen. One of the analyzes carried out is observing the optimal load of the motor with power: 2/1 HP, Rotation: 1500 rpm with reduction ratio: 1500: 1 to determine the load blockage by using the SEW Eurodrive motor manufacturer. From the results of the load analysis, the existing motor specifications are only able to operate for a screen clogging percentage of less than 13.6%.
Ensiklopedia Digital Varietas Ubi Jalar Berdasarkan Klasifikasi Citra Daun Menggunakan KNearest Neighbor Bahtiar Adi Prasetya; Zilvanhisna Emka Fitri; Abdul Madjid; Arizal Mujibtamala Nanda Imron
Elektrika Vol. 14 No. 1 (2022): April 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i1.4329

Abstract

Sweet potato is a source of carbohydrates which is an alternative food in order to accelerate food diversification. This is due to the high productivity of sweet potato so it is very profitable to cultivate. Sweet potato has many varieties, one of the differences is observed based on leaf shape which has four kinds of leaf shape, namely cordate, lobed, triangular and almost divided. The problem that often occurs is that many varieties have similarities, causing difficulties in distinguishing sweet potato varieties, especially for novice farmers. To overcome this problem, the researchers created a digital encyclopedia of sweet potato varieties based on leaf shape using computer vision. The parameters used are area, perimeter, metric, length, diameter, ASM, IDM, entropy, contrast and correlation at angles of 0 °, 45 °, 90 ° and 135 °. The amount of data used is 256 training data and 40 testing data. The K-Nearest Neighbor method is able to classify sweet potato leaf images for digital encyclopedias with an accuracy of 95% with variations in the values of K = 23 and K = 25.
Pengembangan Bag Valve Mask (BVM) Otomatis Mohamad Rofi i; Mohamad Sofie; Patrisius Kusi Olla
Elektrika Vol. 14 No. 1 (2022): April 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i1.4988

Abstract

Ventilators are one of the medical devices that are needed as a breathing apparatus for COVID-19 patients who have respiratory problems. One of the low-cost ventilators currently being developed by several domestic institutions is the ambu bag-based ventilator. The point is an air bag (bag) that is pressed by two carefully controlled automatic clamps, so that it can reach all, while taking into account portability, aesthetics and ease of manufacture. Therefore, the Bag Valve Mask (BVM) or ambu bag is an emergency option to replace the function of the ventilator. This study aims to make an ambu bag that can be applied as a portable mechanical ventilator. Thus, the ambu bag which was originally used manually can be used automatically like a ventilator machine in general. In determining the type of mechanical arm pressure, several parameters such as minute volume, respiratory rate, and tidal volume are used. As recommended by the American Heart Association (AHA) that the tolerance limit for the RR value is +/-10 BPM, it can be said that the automatic BVM as a result of this study can be used with or without a reservoir as needed or with the addition of oxygen
Koordinasi Proteksi Relai Arus Lebih pada Sistem Distribusi Radial Menggunakan Jaringan Syaraf Tiruan Perambatan Balik Andy Frediansyah; Mochammad Facta; Susatyo Handoko
Elektrika Vol. 14 No. 1 (2022): April 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i1.4474

Abstract

To reduce damage to electrical power equipment, protective equipment is needed that is designed as well as possible, so that the protection relay can isolate faults in parts of the distribution network as fast as possible. This backup protection need appropriate relay coordination, so that could protect, if it happens of a primary protection failure. To provide the best service to customers, it is necessary to coordinate the protection relay in the electric power system. To provide protection, the protection relay in the electric power system must be properly coordinated. In this study, we will make a simulation to calculate the TDS and Ipickup values of the overcurrent relay using a artificial neural network backpropagation with software Matlab R2016a. The results of this study can determine the value of TDS (Time Dial Setting) and Ipickup (Current pickup) by overcome the main problem of overcurrent relay protection coordination at the Ammurea II Factory PT. Petrokimia Gresik using a method artificial neural network backpropagation. And, also obtained the results of the minimum value of MSE (Mean Square Error) with the process using the method artificial neural network backpropagation.
Perancangan Portable Continuous Passive Motion (CPM) sebagai Alat Bantu Rehabilitasi Fraktur Lutut Pasca Operasi Berbasis Internet of Things (IoT) Warsat Resti Arbi Nugroho; Syaiful Ari Hangga Hidayah; Rizki Nugraheni Budi Widodo; Adila Eka Saputri; Fatkurohman Nanda Prambudi; Ifnu Agus Riyanto; I Wayan Angga Wijaya Kusuma
Elektrika Vol. 14 No. 1 (2022): April 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i1.4078

Abstract

One of the steps needed in patients with fractures of the knee joint is therapeutic exercises guided by physiotherapists. Therapeutic exercise is a physiotherapy modality by moving the joints both actively and passively. Inspired by this, the Portable Continuous Passive Motion (CPM) tool was created which is a physiotherapy aid for patients after surgery or knee surgery. Portable Continuous Passive Motion (CPM) has been developed based on IoT. Portable Continuous Passive Motion (CPM) uses Arduino LoRa as a micro controller, a stepper motor as a driver and uses a software application as a controller. The form of this research is research and development. From the results of the development, it can be concluded that Portable Continuous Passive Motion (CPM) can be useful for postoperative fracture patients as a practical and flexible postoperative manual therapy tool.
Analisa Perencanaan Pembangkit Listrik Tenaga Surya Atap dengan Sistem Hybrid di PT. Koloni Timur Noor Hajir Sudarjo; Muhamad Haddin; Agus Suprajitno
Elektrika Vol. 14 No. 1 (2022): April 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i1.3784

Abstract

This study discusses the Planning of a Rooftop Solar Power Plant with a Hybrid System at PT East Colony Kudus. Themodel is set as a PLTS whose solar panels are adjusted to the roof area of the building. This PLTS is functioned as a newrenewable energy resource (EBT) in the form of a hybrid between PLTS and PLN's electrical energy source, this is done tohelp supply electricity. Parameters determined include: roof area, solar panel capacity, inverter capacity, battery capacityand payback period. The results show that PLTS with a total of 80 solar panels installed with a capacity of each panel 405Watt peak, then obtained a power capacity of 32.4 kilo Watt peak which is divided into 5 arrays, with a solar charger controllerand inverter using a 10kW capacity of 5 units, 80 batteries with a capacity of 400Ah. So that PLTS is able to contribute 39.3%of the total power needed by PT East Colony (electric power from PLN is 60.7%). This hybrid payback period will return after8 years and 7 months.
Perencanaan Pembangkit Listrik Tenaga Surya Di Perumahan Karyawan Blok B55 PT. Cipta Lestari Sawit Bumirejo Estate Emidiana Emidiana; Perawati Perawati; Haidar Rudin
Elektrika Vol. 14 No. 2 (2022): October 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i2.4733

Abstract

Housing employees of PT. Cipta Lestari Sawit Bumirejo Estate in block B55 is located in the middle of an oil palm planta- tion, so the state electricity company network cannot reach the housing. So, this housing uses a diesel power plant (PLTD) as a source of electricity, its operational hours are limited and it also causes noise and air pollution. From this problem, one suitable solution is to build a solar power plant (PLTS) that does not cause noise and air pollution and its operating hours can be adjusted as needed. In planning PLTS, there are main components that need to be calculated including Solar Panels, Solar Carger Controller (SCC), Batteries, and Inverters. For planning PLTS in employee housing block B55 PT. Cipta Les- tari Sawit Bumirejo Estate requires 273 solar panels with a capacity of 300 wp per unit, 53 solar charge controllers (SCC) with a capacity of 80 amperes, 34 batteries with a capacity of 2000 Ah per unit, and 68 units with a capacity of 6000 watts per unit. to supply electricity to 70 houses and 8 street lights.
Sistem Monitoring Sungai Berbasis IoT Arga Dwi Pambudi; Sari Ayu Wulandari
Elektrika Vol. 14 No. 2 (2022): October 2022
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/elektrika.v14i2.5754

Abstract

Water pollution often occurs due to the disposal of household waste (solid waste and liquid waste) as well as industrial waste, small industry and non-organic waste. This waste will be disposed of through channels which then flow into rivers. Thepurpose of this research is to make a device that can determine the condition of river water, which is polluted or not from along distance. The method used in this study is by taking samples from river water that can represent polluted and unpolluted,then data is taken from these samples which are then processed so that their condition can be known. The conditions that havebeen obtained are then displayed via the web.

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